Question

Exhibit 10-7 In order to estimate the difference between the average hourly wages of employees of two branches of a department store, two independent random samples were selected and the following statistics were calculated. Downtown Store North Mall Store Sample size 25 20 Sample mean $9 $8 Sample standard deviation $2 $1 Refer to Exhibit 10-7. A 95% interval estimate for the difference between the two population means is _____. Selected Answer: b. .071 to 1.928

Answer 1

`E(x)=1`

Explanation:

From the question we are told that:

Sample mean 1
`\=x_1=$9`

Sample mean 1
`\=x_2=$8`

Sample standard deviation 1
`\sigma_1 = $2`

Sample standard deviation 1
`\sigma_2 = $1`

Generally the equation for Point estimate is mathematically given by

`E(x)=\=x_1-\=x_2`

`E(x)=9-8`

`E(x)=1`